/*
 * Copyright (2022) Bytedance Ltd. and/or its affiliates
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once
#include <Optimizer/Rule/Rule.h>

namespace DB
{

/**
 * Pushing projections through inner join so that joins are not separated
 * by a project node and can participate in cross join elimination or join reordering.
 */
class PushProjectionThroughJoin
{
public:
    static std::optional<PlanNodePtr> pushProjectionThroughJoin(ProjectionNode & project, ContextMutablePtr & context);
    static PlanNodePtr inlineProjections(PlanNodePtr parent_projection, ContextMutablePtr & context);
    static std::set<String> getJoinRequiredSymbols(JoinNode & node);
};

}
